Nghiên cứu khả năng tích trữ năng lượng của vật liệu nano carbon chế tạo từ than đá=Research on the energy storage ability of coal- based nano carbon materials

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Tác giả: Trà Hương Đỗ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Nông nghiệp và Phát triển nông thôn, 2024

Mô tả vật lý: tr.93-100

Bộ sưu tập: Metadata

ID: 475931

Thêm vào giỏ

Bài báo này giới thiệu về chế tạo và nghiên cứu khả năng tích trữ năng lượng của điện cực nano carbon chế tạo từ than đá (điện cực CNN). Điện cực CNN có điện dung riêng còn 65,35% so với điện dung riêng ở chu kỳ 1 sau 1.000 CV, điện dung riêng là 253 F/g ở mật độ dòng điện là 0,1 A/g. Phổ tổng trở cho thấy, điện trở chuyển điện tích nhỏ (R ct ) bằng 2,15 Ω. Khi nghiên cứu tính chất điện hóa của điện cực CNN là anode trong cell pin Li - ion cho thấy khả năng lưu trữ tốt ion Li + , dung lượng riêng của pin (Li - ion) tại mật độ dòng tiêu chuẩn C/10 là 306,0 mAh/g, tại mật độ dòng C/20 là 435,5 mAh/g. Cell pin Li - ion sau khi phóng điện có điện trở chuyển điện tích R ct nhỏ. Những kết quả này cho thấy, có thể ứng dụng điện cực CNN làm anode trong pin Li - ion. Nghiên cứu sâu hơn có thể tập trung vào việc tối ưu hóa quy trình chế tạo và khám phá các ứng dụng bổ sung cho các vật liệu điện cực mới này.This study examines the fabrication and performance of electrodes constructed from coal-derived carbon nanotubes (CNN electrodes). These electrodes demonstrate excellent stability, maintaining 65.35% of their initial capacitance after 1000 cyclic voltammetry (CV) cycles. The specific capacitance, measured by the charge-discharge method, is 253 F/g at a current density of 0.1 A/g. Electrochemical impedance spectroscopy reveals the CNN electrodes' high conductivity, with a low charge transfer resistance (Rct) of 2.15 Ω. When assembled as anodes in lithium-ion batteries, the CNN electrodes show significant Li+ ion storage capabilities. At standard current densities of C/10 and C/20, the specific capacities are 306.0 mAh/g and 435.5 mAh/g, respectively. These results highlight the potential of coal-derived nano carbon electrodes for energy storage applications, demonstrating high stability, excellent capacitance, low resistance, and promising lithium-ion storage capability. Further research could focus on optimizing the fabrication process and exploring additional applications for these novel electrode materials.

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